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122 papers · 1 filter
The double AGN in NGC 6240 revealed through 3-5 micron spectroscopy
G. Risaliti, E. Sani, R. Maiolino +7
We present 3-5 micron spectroscopy of the interacting system NGC 6240, showing the presence of two active galactic nuclei. The brightest (southern) nucleus shows up with a starburs…
Threshold effects in relativistic gases
V. V. Begun, L. Ferroni, M. I. Gorenstein +2
Particle multiplicities and ratios in the microcanonical ensemble of relativistic gases near production thresholds are studied. It is shown that the ratio of heavy to light particl…
Gauge-Invariant Resummation Formalism and Unitarity in Non-Commutative QED
Nicola Caporaso, Sara Pasquetti
We re-examine the perturbative properties of four-dimensional non-commutative QED by extending the pinch techniques to the theta-deformed case. The explicit independence of the pin…
Black-holes, topological strings and large N phase transitions
N. Caporaso, M. Cirafici, L. Griguolo +3
The counting of microstates of BPS black-holes on local Calabi-Yau of the form is explored by computing the partition…
Primitive Variable Solvers for Conservative General Relativistic Magnetohydrodynamics
Scott C. Noble, Charles F. Gammie, Jonathan C. McKinney +1
Conservative numerical schemes for general relativistic magnetohydrodynamics (GRMHD) require a method for transforming between ``conserved'' variables such as momentum and energy d…
The Drinfeld double gl(n) \oplus t_n
A. Ballesteros, E. Celeghini, M. A. del Olmo
The two isomorphic Borel subalgebras of gl(n), realized on upper and lower triangular matrices, allow us to consider the gl(n) \opus t_n algebra as a self-dual Drinfeld double. Com…